1D kinematics

Question 1

Can an object have zero velocity but non-zero acceleration?

Answer 1

when an object changes direction

Question 2

When an object is at maximum point, what is its acceleration?

Answer 2

-10m s-2

Question 3

A goods train passes through a station at a steady speed of 10ms -1 ． An express train is at rest at
the station ． The express train leaves the station with a uniform acceleration of． 5ms 一2 just as the goods train goes past. Both trains move in the same direction and on straight， parallel tracks.
How much time passes before the express train overtakes the goods train?

Answer 3

Form simultaneous equations